Opposite-replica modeling machine



Dec. 6, 1927.

Filed Aug. 28. 1926 ATTQRNEY.

Patented Dec. 6, 1927.

', narran STATES Partnr Aorales.v

KNUTE EVERTZ, OF BIELLINGHAM, WASHINGTON.

OPPSITE-REPLICA MODELING IVIVJ'LCHIIVFE.'v

Application led August 28, 1926. Serial No. 132,305.

'My invention relates to limprovements in opposite-replica modeling machines, and the object of my improvement is to, produce a simple machine for shaping in clay an opposite duplication of a model.`

I attain this object with the mechanism illustrated in the accompanying sheet of drawings in which Figure- 1 is a -side elevation of my modeling machine in operative position, Fig. 2 is a front elevation of Fig. 1 and Fig. 3 is a plan view of Fig. 2.

Similar characters refer to similar parts throughout. Certain parts are broken away for lack of space or to show other parts hid-l den thereby.

A vertical guide plate 4 has lugs V5 in which are holes for screws with which plate 4 is fastened to a wall or other upright structure not shown. In plate 4 is a vertical row of spaced holes 6. MountedV for vertical reciprocation in guide plate 4 is .ai slide base 7. On .each end of base 7 is a stud 8 having a foot 9 which isfastened to said base with screws.V Studs 8 are at right angles with base 7 and on thefacing side of each vis mounted ,for reciprocation one. of end lframe members al", each having a socket 10 at each end thereof.` In, opposite sockets 10 are fastened parallel side'. frame members 11. The frame 01.10,' all, 11, 11 is thus mounted for reciprocation between studs 8, 8 in the directions indicated by the arrows. On side rframe members 11, 11 are mounted for vertical reoiprocation upperycrosshead 12 and lower crosshead am.. yHandi-ever. 13 is pivoted on a bracket fastened to base slide 7 at 14' and to oneend vthereof is vpivoted pin a6 reciprocable in a hole inbase 7 and engageable in any one of holes 6 in slideway or guideplatee. Base 7 is set at the desired height by withdrawing pin a6 by pressing on hand lever 13 against spring 15, which is set to react between said lever .13 and base 7, then when base 7 has been moved to thev desired location in elevationv pin a is allowed to engage in the nearest hole 6. Tool arm 16 and stylus arm 17 are mounted for oscillation at 18 on crosshead 12.V Link 19 is pivoted on arm 16 at er, and link 2O is pivoted on arm 17 at a2 and both links are mounted'for oscillation on crosshead a at 21. ylivots alfyand @2 are equidistant from bearing 18.- The construction here being such that 'an angular movement of arm 17 will cause a movement of the same. angle of Ytorn to frame ends 10, 10.

arm and movements causing arms 16 and 17 to separate will cause crossheads 12' and k@L12 `to approach while. movements causing `said arms to vapproach will cause said crossheads to separate from each other.

Stylus a is clamped by screw clamp b1? in, the outer end ofarm 17, and tool @te is fastened by screw clamp blin the outergendiof'arm ,161 at the` same distance from bearing 18v` as isstylus al?. Thus, when stylus all lisjmoved `through an arc around bearing 18 ,tecla16 is caused to lmove through an equal arc around the same center. Also, when stylus al'fis moved upor down'by causing cross#k heads 12 anda12 to reciprocate on guide frame members 1111 tool als iscaused t0 move up or down an equal amount. Then. any plane figure described by stylus alwill cause tool als to describe the same sortof figure inthe vertical and the opposite of the same figure in the horizontal inasmuch as stylus a" and tool L16 move equally and'opposite in the horizontal.l When frame al". a1,.11. 11 is moved forward: or backward Von studs 8.8 stylus au and tool amare moved l in the same direction to an equal amount.

tion in space described by stylus a is eXactly duplicated by tool al in the vertical, and

in the horizontal forward and backward. .andalso in thehorizontal to the right-'and fort sincethey are neither aided nor opposed VFrom all of which it appears4 that anymoyward and backward arem'ade with slight efby the weight of the mechanism..l But vertical movements of 'said point andvtool are opposedor aided by the weight of c rossheads 1 12and ci.12 added to the weight of arms 16 and 17 and links {19.and 20. ToV counterbalance these latter parts counterweight 23.VV

fof equal weight therewitlnis hung on string 25 which is passed overshealve 24 and fastened to bracket'26 attached yto crosshead'12. n Weight 23 is mounted for vertical reciproca tion by bearings (L23 slidable on guide rod A 22. Guide rod 22 is fastened at top and bot-A Sheave 24 is mounted' for revolution in a bearing in bracket @'24 fastened to upper frame' bearing member a1". Thus, both said crossheads 12 f v and am, and weight 23 are installed on frame ai", ai, 11a 11. for equal and opposite move V`pleted by hand without losing the frtldiii` ments in the vertical, and said weight is a suitable counterpoise forarms 16 and 17 and said crossheads. In this manner the vertical movements of stylus and tool are made withlout sensible aid or hindrance from gravity.

`ofthe model Vover the' surface of which Athe lstylus has been moved except the model design is duplicatedl inthe clay in a relaner. By 'continuing to copy a number of proximate'- areasv of the model -oii the clay the precise character, dimensions, and relative location of the lines and surfaces of the model are suiiiciently `developed iii the clay that the` desired design thereon may be comof lines' andsu'rfaces natural to theV original and so difficultto reproduce by hand in an exact copy thereof.v It may be noted that this machine is especially suited for completing" that class of designs in which there is a duplication ofthe design on opposite sides of medial line. i

In Fig: 1 the arrows indicate the outl and ,in direction of the movements of frame al", al?, 11, 11, while in Fig; '2 a second osition for arms 16 and 17 is shown at '16, 17 iii dotted lines wherein upper Vcrosshead remains stationary and also weight 23 remainsv stationary. Also said arms are shown iii dotted lines in a thirdposition at 16, 17, more closely folded tothe s* frame, in which theiipper crossheadhas been moved downward and the couiiterweiglit moved upward to 23". -In this way all parts of the model may begone over within the range of one setting of base 7 as heldy byl pin a"i in one of holes 6, Then othersettings ofv said base are made with said pin engaged inl other of holes 6 tillA the entire height of the model has beenfco ied.

Having tlius' disclosed my invention, what -crosshead passed over said sheave I claim as new therein and desire to secure by Letters Patent ,is,- y

l. In combination, a vertical guidewafy, a base slidable on said vertical guideway, i'cleasable means to retain said base in desired positions oii said slideway, horizontal guide kstuds fastened tov said base in parallel'relation, a frame having vertical guide rods mounted for horizontal reciprocation on said guide studs, upper and lower crossheads mounted for vertical reciprocation on said vertical guide rods, a pair of arms mounted for oscillation on a common pivot in said upper crossli'e'ad, a pair of equal link-s inoi'i-n'tA ed for oscillation on a common pivot insa'id lower crosshead each pivoted to one of said ari-iis at an equal distance from said common pivot thereof', a stylus fastened inthe end ofoiie of said arms, and a clay-working tool fastened the-end of the other of said arms for oscillation on a common* pivot 'in' said Y upper crossliead, a pair of equal links mountedfor oscillation on a common'pivot infsaid lower crosshead each pivoted to one of said arms at an equal distance fromsaid common pivot thereof, a stylusfastened in the end of one of said arms, a clay-working toolffa'stened in the end of said other arm at the same distance from said common pivot thereof as said stylus, a vertical guide rod fastened to said frame, a counterweight'mounted for reci rocation on said Guide rod a bracket fastened to the upper eiid of said frame, ar

revolution on said sheave mounted for bracket, and a string fastened to'said upper and fastened to said counterweight. y i

KNUTE EVERTZ. f 

